Air is a good insulator because .

air molecules are tightly packed together
air molecules are spaced far apart
it is easy for molecules to transfer heat to one another
air reflects heat back into space

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

Given the following information: mass of proton = 1.00728 amu mass of neutron = 1.00866 amu mass of electron = 5.486 × 10^-4 amu speed of light = 2.9979 × 10^8 m/s calculate the nuclear binding energy (absolute value) of 3li^6. which has an atomic mass of 6.015126 amu. j/mol.